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You don't want to overfertilize your plant. That can prevent blooming. Your calla lily may need a dormant period to bloom. Here is how:

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/make-calla-lily-bloom.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm

It is unusual but not uncommon. Does that make sense? I have seen pictures posted online with this alteration and have seen it in my own garden. We've all seen blooms that failed to open; something went wrong in the process. Duplicate calla lily blooms are also something that went different but, in this case, it is a pleasant change. A "sport" is a plant that undergoes a desirable genetic change. Plant breeders and plant enthusiasts cherish these special plants. Here is more info on "sports": https://www.gardeningknowhow.com/garden-how-to/info/plant-sport-mutations.htm

Your lilies may not be getting enough light. Here are two articles- one that addresses the green blooms, and the other all about caring for your calla bulbs in the winter:

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/green-calla-lily-blooms.htm
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-lily-winter-care.htm

If it's not blooming at all, your soil may be too high in nitrogen and not high enough in phosphorus. Feed them with a higher-phosphorous fertilizer - your local garden center can help you with this. It also may not be getting enough water and sun to bloom.

The strange thing is you should be digging it up in the fall and storing it over winter as calla lilies aren't hardy in zone 6. So if you are leaving it in the ground, it may be too damaged to bloom properly.

Here's an article that may help: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/make-calla-lily-bloom.htm

They have the ability to go dormant, but do not require it to be healthy. As long as the correct conditions are provided, they can grow quite well indoors.

With that being said, it would appear to be an overwatering issue. The soil does need to dry out just a bit between waterings. Usually, you want to aim for a complete dry out down to about an inch or two.

This article will help you to care for them in container:

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/container-grown-calla-lilies.htm

Does it get plenty of sun? If it's in more than 25 percent shade it may not be drying out fast enough. Well-draining soil is essential for Calla lilies.

I find Calla lilies to be somewhat temperamental. They do like evenly moist soil, but wait till they dry out a bit before watering again. There's a fine line between "moist" and "saturated."